' VLAX.CLS v2.0 (Last updated 8/1/2003)
' Copyright 1999-2001 by Frank Oquendo
'
' 该程序由明经通道修改支持2004版本
' http://www.mjtd.com
'
' Permission to use, copy, modify, and distribute this software
' for any purpose and without fee is hereby granted, provided
' that the above copyright notice appears in all copies and
' that both that copyright notice and the limited warranty and
' restricted rights notice below appear in all supporting
' documentation.
'
' FRANK OQUENDO (THE AUTHOR) PROVIDES THIS PROGRAM "AS IS" AND WITH
' ALL FAULTS. THE AUTHOR SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTY
' OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. THE AUTHOR
' DOES NOT WARRANT THAT THE OPERATION OF THE PROGRAM WILL BE
' UNINTERRUPTED OR ERROR FREE.
'
' Use, duplication, or disclosure by the U.S. Government is subject to
' restrictions set forth in FAR 52.227-19 (Commercial Computer
' Software - Restricted Rights) and DFAR 252.227-7013(c)(1)(ii)
' (Rights in Technical Data and Computer Software), as applicable.
'
' VLAX.cls allows developers to evaluate AutoLISP expressions from
' Visual Basic or VBA
'
' Notes:
' All code for this class module is publicly available througout various posts
' at news://discussion.autodesk.com/autod ... stomization.vba.Idonot
' claim copyright or authorship on code presented in these posts, only on this
' compilation of that code. In addition, a great big "Thank you!" to Cyrille Fauvel
' demonstrating the use of the VisualLISP ActiveX Module.
'
' Dependencies:
' Use of this class module requires the following application:
' 1. VisualLISP

Private VL As Object
Private VLF As Object

Private Sub Class_Initialize()
'根据AutoCAD的版本判断使用的库类型
If Left(ThisDrawing.Application.Version, 2) = "15" Then
Set VL = ThisDrawing.Application.GetInterfaceObject("VL.Application.1")
ElseIf Left(ThisDrawing.Application.Version, 2) = "16" Then
Set VL = ThisDrawing.Application.GetInterfaceObject("VL.Application.16")
End If

Set VLF = VL.ActiveDocument.Functions
End Sub

Private Sub Class_Terminate()
'类析构时，释放内存
Set VLF = Nothing
Set VL = Nothing
End Sub

Public Function EvalLispExpression(lispStatement As String)
'根据LISP表达式调用函数
Dim sym As Object, ret As Object, retVal
Set sym = VLF.item("read").funcall(lispStatement)

On Error Resume Next

retVal = VLF.item("eval").funcall(sym)

If Err Then
EvalLispExpression = ""
Else
EvalLispExpression = retVal
End If
End Function

Public Sub SetLispSymbol(symbolName As String, value)

Dim sym As Object, ret, symValue
symValue = value

Set sym = VLF.item("read").funcall(symbolName)

ret = VLF.item("set").funcall(sym, symValue)
EvalLispExpression "(defun translate-variant (data) (cond ((= (type data) 'list) (mapcar 'translate-variant data)) ((= (type data) 'variant) (translate-variant (vlax-variant-value data))) ((= (type data) 'safearray) (mapcar 'translate-variant (vlax-safearray->list data))) (t data)))"
EvalLispExpression "(setq " & symbolName & "(translate-variant " & symbolName & "))"
EvalLispExpression "(setq translate-variant nil)"
End Sub

Public Function GetLispSymbol(symbolName As String)

Dim sym As Object, ret, symValue
symValue = value

Set sym = VLF.item("read").funcall(symbolName)

GetLispSymbol = VLF.item("eval").funcall(sym)
End Function

Public Function GetLispList(symbolName As String) As Variant
Dim sym As Object, list As Object
Dim Count, elements(), i As Long

Set sym = VLF.item("read").funcall(symbolName)
Set list = VLF.item("eval").funcall(sym)

Count = VLF.item("length").funcall(list)

ReDim elements(0 To Count - 1) As Variant

For i = 0 To Count - 1
elements(i) = VLF.item("nth").funcall(i, list)
Next

GetLispList = elements
End Function

Public Sub NullifySymbol(ParamArray symbolName())

Dim i As Integer

For i = LBound(symbolName) To UBound(symbolName)
EvalLispExpression "(setq " & CStr(symbolName(i)) & " nil)"
Next
End Sub

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